Isolated ground in dedicated room/new construction?

Another informational interesting thread.

Among other things, this got me taking a look back in time at the manual for my first tube amp (which I stilt own & have owned for going on 30 years,a Cary SLA 70B) and under "GND" the manual states that;  "For "audio-purists" this should be connected to an earth ground rod via the shortest lead possible - this is not essential for proper operation.  This ground will help insure immunity to RF interference and AC ground loops."

I have a vague recollection of speaking with a representative of another audio manufacturer, who shall remain nameless, who suggested that I "float the ground."

On that note, a couple of years ago I upgraded my digital to the Marantz SA10, and it has a two-blade receptacle for the supplied two blade power cord.

Immatthewj- That was/is a good little amp.  The bad thing was having to take the bottom off the amp to go in and bias it.  Never could figure out why Dennis did that. Hopefully you drilled a hole in the chassis and mounted the bias pot and mount a couple test point terminals on the outside also.  Makes it much easier.  Did that for several people.  Sweet sounding amp!

@harpo75  , actually mine is a SLA-70B Signature, which may be the reason it has  the bias pot and the bias jack accessible behind the transformers?  That must have been a pita to bias!  I don't remember what all the differences were with the Signature vs the SLA-70B (nonsignature) . . . 6550s instead of EL34s, and it has a standby switch on the rear apron that maybe the nonsignature version didn't come with.

I get it down every once in a blue moon when my other amp goes down, and you are correct--it is still a swet sounding amp.

Immatthewj- Just for your reference then if you ever sell it that is the SLA-70B Signature version 2. If you add high quality coupling caps and a beefed up power supply (more electrolytic capacitance and big polypropylene bypass caps) it’s very good still. I have custom fully balanced SLAM-100 mono blocks with separate mono block power supplies running KT150’s. Very nice amplifiers.